Apparatus for sharpening drills or drill-bits.



PATENTED SEPT. 1, 1908.

W. B. KIMBER.

APPARATUS FOR SHARPENING DRILLS 0R DRILL BITS.

APPLICATION FILED JAN. 29, 1907.

THE mum's R5 01.7., wAsmueraN, n. c,

WALTER EDWARD KIMBER, OF JOHANNESBURG, TRANSVAAL.

APPARATUS FOR SHARPENING DRILLS OR DRILL-BITS.

Specification of Letters Patent.

Patented Sept. 1, 1908.

Original application filed. July 10, 1906, Serial No. 325,489. Divided and. this application filed January 29, 1907. Serial No. 354,629.

To all whom it may concern:

Be it known that I, WVALTER EDWARD KIMBER, a subject of the King of Great Britain, and resident of Johannesburg, Trans.- vaal, have invented certain new and useful Improvements in Apparatus for Use in the Sharpening of Drills or Drill-Bits, of which the following is a specification.

. This invention has reference to apparatus or tools intended for use in the operation of sharpening rock-drills or rock-drilling machinebits, and it relates more particularly to tools designed for forming the cutting edge such as is provided on percussion rock drills-on the face of the drill preparatory to its being operated upon in the forging machine.

The object is to provide a machine or apparatus which will efliciently bring up the corners or outer extremities of the wings of the ordinary star or similar drills or bits, which, as is well known, are subject to the largest amount of wear.

The invention constituting the subject matter of the present application is a division of an application filed by me on the 10th July, 1906, bearing official Serial Number 325,489.

The present invention consists essentially in the construction of the tools for performing the above operation, and in means for actuating said tools.

The invention will now be'fully described by aid of the accompanying drawing, in which Figure 1 is a side elevation, partly in section, of the apparatus. Fig. 2 is a front elevation of the striker or upper movable tool. Fig. 3 is an elevation of the bottom stationary tool or anvil die, Fig. 4 is a perspective view illustrating the manner in which the striker or upper movable tool operates on the drill or bit to bring up the corners, and Fig. 5 is a rear elevation of Fig. 1.

The tools comprise a striker or upper movable tool 93 and a bottom and preferably stationary tool or anvil die 94 in which latter the drill or bit 12 is held while it is being operated upon. by the striker 93. The striker 93 which may be of cylindrical or other suitable external configuration, is at the ex tremity which strikes the. drill or bit beveled oil in two opposite directions forming be tween them an oblique angle. The bottom or rear bevel is approximately horizontal and the top or front bevel corresponds more or less to the bevel on the ends of the wings which form the cutting edge. In the front bevel of the tool is formed a groove 95 which when said tool is in its operative position, is vertical or approximately vertical. The beveled striking face is made slightly hollow or concave and fluted, as seen more particularly at 96 in Fig. 4, so that it impacts 011 the corners or outer ends of the wings or webs 10 of the drill, and by working them outward increases the thickness of the wings or webs at these points. The inclination of the striking face of the tool imparting the bevel to the Wings so forms, more or less roughly, the cutting edge.

The bottom stationary tool or anvil die 94 consists of a block mounted on a standard or frame 97 at a suitable working height. In the block is formed a vertical groove 98 and in the bottomof this'vertical groove is formed a cylindrical or other suitably shaped. hole 99. In the groove 98 is fitted a piece 100 which is preferably detachable, so that it may be easily removed and" renewed. This piece 100 is made concave at the top, see Fig. 3, and constructed with a cylindrical or other projection 101 corresponding to the hole 99 formed in the bottom of the groove 98 in Which it fits and by which it is retained in position. The concave piece 100 is rectangular in shape, and serves, when the drill is being operated upon, to reduce the radial length of the wings so that the drill is made somewhat smaller in gage than the finished drill. The subsequent forging and dollying operation brings the drill to its proper gage and finishes it. When the piece 100 is in position the groove 98 formed in the tool 94 above the concave upper surface of said tool is somewhat less in depth than the section of the steel or the radial length of the wings 10, so that the side wings, which are horizontal for the time being, do not rest upon the upper surface of the bottom tool 94 at the sides of said groove while they are being operated upon by the striker.

As shown in dotted lines in Fig. 3 the horizontal wings 10 are an eighth of an inch (more or less) above the top of the anvil die 94.

The removable part 100 of the anvil die 94 permits of these tools being employed for effecting the sharpening or different sizes of drills. To accomplish this all that is necessary is to remove and replace the detachable tool or anvil die 94:.

piece 100 by a thicker or thinner one so that the depth of the groove 98 is increased or decreased as required according to the size of the drill or bit to be operated upon. The pieces 100 are by preference of such a size that for allsizes of drills they maintain the horizontal wings 10 a uniform distance (say an eighth of an inch more or less) from the top of the tool at the sides of the groove 98.

For the purpose of actuating the striker or movable tool 93 I prefer to arrange it in an inclined cylinder 102, bolted or otherwise suitably fixed to the standard 97 and in a suitable position in relation to the bottom The striker93, see Fig. 2, projects into the lower end of the cylinder 102, see Fig. 1, and is adapted to re ceive the impacts of the piston or reciproeating percussive member 103. The admission of the actuating fluid (steam or air) to the cylinder 102 is controlled to regulate the blow of the striker 93. The stiker 03 is fitted with a horizontal pin 104 or otherwise constructed with two lateral projections which have attached to them the ends of two springs 105 and the other ends of which are attached at 106 to the exterior of the cylinder 102 or otherwise. The springs 105 serve to raise the striker 93 a short distance-limited by the engagement of an annular or other projection 107 formed on the striker 93 with the end of the cylinder 102 or other fixed point-sufficient to permit of the insertion of the drill the requisite distance in the anvil die 94.

What I claim as my invention and desire to protect by Letters Patent is:

1. In apparatus for sharpening rockdrills or bits, a too]. for bringing up the colners comprising a striker having a concave striking face provided With a fluted cutting edge, said face having a groove to receive the upper vertical wing of a drill or bit when the striker is operating on.the horizontalwings of said drill or bit to impart the bevel to roughly form the cutting edge, and means for operating said. striker, in combination with an anvil formed to hold the drill or bit to present said horizontal wings of the drill or bit to the fluted cutting edge of the tool aforesaid.

2. In apparatus for sharpening rock-drills or bits, in combination, tools for bringing up the corners of a drill or bit, comprising an anvil die formed with a vertical recess to receive the bottonrvertieal wing of a drill or bit so that the horizontal wings thereof are above the top of the block, and a striker having a concave on the striking face provided with a fluted cutting edge, beveled OH in two directions forming an oblique angle, and grooved in. the front bevel to receive the upper vertical wing of the drill or bit when the striker is operating on the horizontal wings to impart the bevel roughly to form the cutting edge, and mounted to reciprocate above and at an oblique angle to the anvil and in. line with the end of a drill or bit when placed in position, as set forth.

3. ln apparatus for sharpening rock-drills or bits, in combination, tools for bringing up the corners of a drill or bit, comprising an anvil die formed to support a drill or bit so that the horizontal wings thereof are above the top of the die, and a striker made concave on the striking face beveled off in two directions forming an oblique angle and grooved in the front bevel to receive the upper vertical wing of the drill or bit when the, striker is operating on the horizontal wings to impart the bevel roughly to forni the cutting edge, and mounted to reciprocate above the anvil and in line with the end of a drill or bit when supported by said anvil die, as set forth.

In witness whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WALTER EDWARD KIMBER.

Witnesses CHAs. OVENDALE, R. OVENDALE. 

